CVE-2006-6014 in NetBSD
Summary
by MITRE
The NetBSD-current kernel before 20061028 does not properly perform bounds checking of an unspecified userspace parameter in the ptrace system call during a PT_DUMPCORE request, which allows local users to have an unknown impact.
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Analysis
by VulDB Data Team • 04/28/2026
The vulnerability identified as CVE-2006-6014 affects the NetBSD operating system kernel version prior to the 20061028 release, specifically within the ptrace system call implementation. This issue represents a classic kernel boundary checking flaw that occurs during the processing of PT_DUMPCORE requests, which are used for debugging and core dump operations. The ptrace system call serves as a fundamental interface for process tracing and debugging in Unix-like systems, allowing one process to observe and control the execution of another process. The vulnerability arises from inadequate validation of user-supplied parameters, creating a potential pathway for privilege escalation or system instability.
The technical flaw manifests in the kernel's failure to properly validate bounds of a userspace parameter during the execution of a PT_DUMPCORE request through the ptrace system call. This type of vulnerability falls under the CWE-129 category of Improper Validation of Array Index, which is classified as a weakness that can lead to buffer overflows or other memory corruption issues. The unspecified nature of the userspace parameter means that the exact memory location or data structure being improperly validated remains unclear, but the impact suggests that an attacker could manipulate the kernel's memory management during core dump operations. This particular vulnerability is classified as a local privilege escalation vector since it requires a user to already have access to the system to exploit it, but the consequences can be severe in terms of system stability and potential privilege elevation.
The operational impact of this vulnerability extends beyond simple system crashes or memory corruption. Local users with access to the system could potentially leverage this flaw to gain elevated privileges or to execute arbitrary code within kernel space. The PT_DUMPCORE functionality is typically used by debugging tools and system administrators for crash analysis and process inspection, making this vulnerability particularly concerning for systems that rely on these debugging capabilities. Attackers could exploit this weakness to bypass security controls, access restricted memory areas, or potentially escalate their privileges to root level access. The vulnerability's classification as a local privilege escalation means that the attacker does not need network access or special authentication mechanisms, as the exploit can be executed from within the system itself.
Mitigation strategies for this vulnerability should focus on immediate system updates and patches provided by NetBSD security teams. Organizations should prioritize updating their NetBSD systems to versions released after October 28, 2006, which contain the necessary kernel fixes for proper bounds checking in the ptrace system call implementation. Additionally, system administrators should implement monitoring for suspicious ptrace activity and core dump operations, particularly those involving PT_DUMPCORE requests. The vulnerability's nature aligns with ATT&CK technique T1055.001 for privilege escalation through kernel exploits, making it important for security teams to monitor for unusual process tracing activities. System hardening measures including disabling unnecessary debugging capabilities, implementing proper user access controls, and maintaining regular security updates should be implemented as part of a comprehensive defense strategy. The vulnerability also highlights the importance of proper input validation in kernel space operations, emphasizing the need for rigorous code review processes and formal verification techniques for critical system calls.